Apex domains cannot have CNAME records.
Question and response
Question
dig adoptelec.com. NS
Answer
adoptelec.com. 4 NS ns-1889.awsdns-44.co.uk.
adoptelec.com. 4 NS ns-1430.awsdns-50.org.
adoptelec.com. 4 NS ns-736.awsdns-28.net.
adoptelec.com. 4 NS ns-1587.awsdns-06.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0